GRASS

GRASS

GRASS is a powerful computational engine for raster, vector, and geospatial processing. It supports terrain and ecosystem modeling, hydrology, data management, and imagery processing. With a built-in temporal framework and Python API, it enables advanced time series analysis and rapid geospatial programming, optimized for large-scale analysis on various hardware configurations.

The GRASS project is an international team effort with scientists and developers participating from various fields. GRASS – Geographic Resources Analysis Support System has been under continuous development since 1982 and has involved a large number of federal US agencies, universities, and private companies. The core components of GRASS were accomplished by the Construction Engineering Resesarch Laboratory (CERL) in Champaign, Illinois (1982-1995). Since 1997 a worldwide network of developers continues to release new GRASS versions (see GRASS history).

The strength and success of GRASS relies on the user community. With this in mind, the philosophy of the GRASS Development Team is to encourage users to develop their own unique tools and applications for GRASS. Everybody is invited to join the GRASS development team and improve this powerful suite under the terms of GNU General Public License.

Core features

Analysis
- Raster: map algebra, interpolation, mask, solar analysis, landscape structure
- Vector: network analysis, buffer, overlays, point cloud data
- Temporal: time series data management and temporal analysis
- Image processing: aerial and UAV image, satellite data, supervised, unsupervised, and object-based classification
- Terrain analysis: contour and surface generation, least cost path, slope and aspect analysis
- Hydrology: flow directions, streams, watersheds (basins), topographic index
- Point cloud analysis: LiDAR, interpolation, binning, vegetation metrics
- 3D raster (voxel) analysis: 3D map algebra, 3D interpolation, 3D visualization
- Spatial statistics: correlation and covariance analysis, regression
- Geocoding of raster and vector maps
Interfaces
- Graphical user interface (GUI) for new users and interactive analysis
- Command line interface (CLI) for power users and text-based environments
- Python scripting library
- Object-oriented Python API
- C API
- Generic XML and WPS description of every module
Third-party interfaces
- QGIS through the Processing toolbox
- Web interface through WPS servers
- R has an interface to GRASS, called rgrass
- Ruby also has an interface called grassgis
- ZOO-Project uses GRASS as back-end for OGC web services
Open science ready
- Publishing algorithms through GRASS
- Longevity, preservation, and maintenance of the code
- References to papers listed in the documentation
- Source code linked from documentation
- Algorithms created by scientists for scientists
- Interfaces and APIs addressing needs of different scientists
- Distribution of binaries for different platforms
- 40+ years of documented source code